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2009 911 c4s misfires one 1 bank - any porsche techs here?

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6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH2009 911 c4s misfires one 1 bank - any porsche techs here?

Leading reported evidence

Inspect cat, no deterioration visible, pre and post temps ok

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

-visually inspected cat, no deterioration visible, pre and post temps ok

Original post Read captured discussion
2009 911 c4s misfires one 1 bank - any porsche techs here?
Read full discussion summary

Leading evidence: 'Inspect cat, no deterioration visible, pre and post temps ok' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Inspect cat, no deterioration visible, pre and post temps ok' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 6 captured posts examined · 0 partial discussions

Compare 3 other evidence results

Replace coils and plugs

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

-swapped coils and plugs

Original post Read captured discussion
2009 911 c4s misfires one 1 bank - any porsche techs here?

Replace vario cam actuating solenoids

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

-swapped vario cam actuating solenoids

Original post Read captured discussion
2009 911 c4s misfires one 1 bank - any porsche techs here?

Smoke-test intake - no visible leaks

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

-smoke tested intake - no visible leaks

Original post Read captured discussion
2009 911 c4s misfires one 1 bank - any porsche techs here?
Frequently discussed actions (4)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Inspect cat, no deterioration visible, pre and post temps ok

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

-visually inspected cat, no deterioration visible, pre and post temps ok

Original post Read captured discussion
2009 911 c4s misfires one 1 bank - any porsche techs here?

Replace coils and plugs

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

-swapped coils and plugs

Original post Read captured discussion
2009 911 c4s misfires one 1 bank - any porsche techs here?

Replace vario cam actuating solenoids

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

-swapped vario cam actuating solenoids

Original post Read captured discussion
2009 911 c4s misfires one 1 bank - any porsche techs here?

Smoke-test intake - no visible leaks

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster

-smoke tested intake - no visible leaks

Original post Read captured discussion
2009 911 c4s misfires one 1 bank - any porsche techs here?
Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Pelican Parts: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T163944Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Bank 1 , cylinder 1, 2, 3 misfires only after full operating temp reached and rpm brought above 2000 rpm. -swapped coils and plugs -swapped vario cam actuating solenoids -visually inspected cat, no deterioration visible, pre and post temps ok -manifold vacuum ok -smoke tested intake - no visible leaks -air oil separator seems ok -all measured values i can check with fuel, MAF, cats, cams, temps, voltages, are within spec/nominal -intake flap actuator operates (can't see flap position) The only thing that is off is the correction value for H040 = -25% which usually indicates an air leak after the throttle body if im not mistaken.... Any thoughts?

POST 2Original post

What codes are being shown associated with this?

POST 3 / ORIGINAL POSTEROriginal post

P0300, p301, p0302, p0303. Jus a multiple cylinder misfire code, and misfires for cyl 1-3

POST 4Original post

When that happen to me..my injector wires got chewed on...

POST 5Original post

Is that correct where it will only misfire when its hot and only after 2000 RPM's. So when the RPM's drop back to idle, the misfires go away, even when warm? Do you have a Durametric to try and activate high valve lift? What do your fuel trims and o2 sensors voltage look like?

POST 6Original post

You need a software tool to read the valve timing value off that bank. Compare that to the other side.

This is a source reference. Confirm exact model applicability in the original material.